Police in Taiwan used a set of spectrum analyzers to catch at least
three people suspected of cheating on an exam by monitoring them for
mobile phone signals, a first case of its type, the equipment maker said
on Wednesday.

Officers used three FSH4 analyzers specially configured by the German
manufacturer Rohde & Schwarz to monitor an exam in south Taiwan for
prospective government workers, said senior company engineer Lai
Cheng-heng.

The handheld devices are normally used to help telecom companies check
the strength of phone signals, but Taiwan's National Communications
Commission had asked the designer for a special order aimed at catching
exam cheats.

"They didn't tell us what they were going to do. They just told us what
to design, and later we found out what it was for," said Lai, who wrote
the analyzer software used to monitor the exam.